Refactors keyboard related code so mash can use a keyboard

ash/keyboard/keyboard_ui_mus.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/keyboard/keyboard_ui_mus.h"
+
+#include "ash/keyboard/keyboard_ui_observer.h"
+#include "ash/mojo_shell.h"
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "mojo/shell/public/cpp/shell.h"
+
+namespace ash {
+
+KeyboardUIMus::KeyboardUIMus() : is_enabled_(false), observer_binding_(this) {
+  GetMojoShell()->ConnectToService("mojo://keyboard", &keyboard_);
+  keyboard_->AddObserver(observer_binding_.CreateInterfacePtrAndBind());
+}
+
+KeyboardUIMus::~KeyboardUIMus() {}
+
+void KeyboardUIMus::Hide() {
+  keyboard_->Hide();
+}
+
+void KeyboardUIMus::Show() {
+  keyboard_->Show();
+}
+
+bool KeyboardUIMus::IsEnabled() {
+  return is_enabled_;
+}
+
+void KeyboardUIMus::OnKeyboardStateChanged(bool is_enabled,
+                                           bool is_visible,
+                                           uint64_t display_id,
+                                           mojo::RectPtr bounds) {
+  if (is_enabled_ == is_enabled)
+    return;
+
+  is_enabled_ = is_enabled;
+  FOR_EACH_OBSERVER(KeyboardUIObserver, *observers(),
+                    OnKeyboardEnabledStateChanged(is_enabled));
+}
+
+}  // namespace ash